@HukAleksandra an understanding of whether the transaction is genuine or not. That extra time spent with you may be frustrating but is borne out of wanting to protect the customer.
@HukAleksandra The cashier was merely protecting you. What if he hadn’t asked those questions and handed your cash over to a fraudster. Fraudulent activity is the modern day armed robbery. Bank staff have a duty of care to look after yours/our money and asking questions such as he asked builds